Introduction to Atomic Structure

All elements are composed of 

• molecules
• atoms
• neutrons
• compounds

What is the mass number of carbon (C)?

• 6
• 12
• 13
• C

How many electrons are in an atom of carbon (C)? (Remember APE! Atomic Number = # of Protons and # of Electrons)

• 6
• 12
• 13
• C

Tags

NGSS.MS-PS1-1

How many electrons are in an atom of carbon (C)? (Remember APE! Atomic Number = # of Protons and # of Electrons)

• 6
• 12
• 13
• C

Tags

NGSS.MS-PS1-1

How many neutrons are in an atom of sodium (Na)?  (Remember M-A=N! Mass # - Atomic # = Neutrons)

• 6
• 12
• 13
• C

Tags

NGSS.MS-PS1-1

What is the mass number of sodum (Na)?  (Don't forget to round!)

• 6
• 12
• 23
• C

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

The dense, positively charged mass located in the center of the atom.

• nucleus
• proton
• isotope
• molecule

The _________ of an element equals the number of protons in an atom of that element

• mass number
• atomic weight
• atomic number
• isotopes

Tags

NGSS.HS-PS1-7

The __________ of an atom is the sum of the protons and neutrons in the nucleus of that atom.

• mass number
• atomic number 
• atomic weuight
• isotope weight